Person-number detecting system
US4849737A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1987 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Nov 19, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S250/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A person-number detecting system which comprises a detector for detecting infrared rays emitted from persons' bodies to generate an output signal while a scanning optical means circularly scans a visual field of the infrared ray detector, a means for amplifying the output signal of the detector, a means for converting it to a signal necessary for detection of the number of persons located within the field, a means for discriminating the number of persons on the basis of the converted signal, and a means for outputting person number information. The system can be made simple and inexpensive, while realizing a highly precise detection of the number of persons in a wide detection zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.